It’s all hypothetical and easy to make judgement when we know we have no chance of ever having that choice to make.
I’m as passionate about Utd as I could possibly be. And I hate Liverpool as much as I love Utd.
But if I’m a professional footballer playing for a West Ham or Everton for example and Liverpool came in for me, of course I would jump at the chance. Especially if it was my first big chance at a big club.
I don’t think any die hard passionate Utd fan would turn down that opportunity if they were in the same position. Most Pro footballers are more concerned about playing and enjoying football rather than watching football like us fans. You’ll be surprised how many pros don’t actually watch that much football and hence lose their affiliation and passion for one particular club.
Anyhow, my point was in reference to Sancho. Even if he was a passionate hard core Chelsea fan, there is absolutely no way that would hold him back from joining Utd.